Automatic merge from submit-queue (batch tested with PRs 37325, 38313, 38141, 38321, 38333)

Fix running e2e with 'Completed' kube-system pods

As of now, e2e runner keeps waiting for pods in `kube-system` namespace to be "Running and Ready" if there are any pods in `Completed` state in that namespace.
This for example happens after following [Kubernetes Hosted Installation](http://docs.projectcalico.org/v2.0/getting-started/kubernetes/installation/#kubernetes-hosted-installation) instructions for Calico, making it impossible to run conformance tests against the cluster. It's also to possible to reproduce the problem like that:
```
$ cat testjob.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: tst
  namespace: kube-system
spec:
  template:
    metadata:
      name: tst
    spec:
      containers:
      - name: tst
        image: busybox
        command: ["echo",  "test"]
      restartPolicy: Never
$ kubectl create -f testjob.yaml
$ go run hack/e2e.go -v --test --test_args='--ginkgo.focus=existing\s+RC'
```